ineffectual \in-ih-FEK-choo-uhl\ (adjective) - Not producing the proper effect; without effect; weak; useless; futile; unavailing.
"Surely we have enough on our plates with one badly burned, utterly ineffectual member without risking more and possibly worse setbacks." -- Brian Lumley, 'The Touch'
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Ineffectual ultimately comes from Latin in-, negative prefix + effectus, "effect, result," from efficere, "to produce, to effect," from ex, "out of" + facere, "to make."